Fiber-Optic Sensor Strain Measurements Under Asphalt Layer During and After Construction

This project shows that Fiber-Optic Sensor Strain (FOSS) can be installed in Hot Mix Asphalt (HMA) and used to measure strains in the pavement under different types of loadings. A semi rigid flexible pavement system was instrumented using new FOSS technology. The purpose of this research experiment was to monitor the long-term strains under repeated traffic loading. The pavement was built and instrumented in 2004 and long-term monitoring is continued to date in this pavement section. This paper presents the Multi Layer Elastic Analysis (MLE) performed prior and after the gauges installation to monitor the strain during construction and after construction. In-situ strain during construction under HMA truck delivery, paver and roller operations are presented and compared to theoretical MLE analysis. In addition, In-situ strain after construction under a dump truck loading and FWD loading at multiple load levels are presented and compared to theoretical and in-situ MLE analysis. This paper shows that in-situ strain under construction is at least 50 folds those obtained from MLE analysis. The paper shows that the gauges were sensitive enough to collect strain under construction at elevated construction temperatures and moisture conditions. Furthermore, the paper shows that the MLE analysis results are in very close proximity to the measured deflection under dump truck loading and FWD loading. The results show that MLE analysis can be used to validate and calculate the stains in asphalt sections. Long term performance is continued and the experiment is planned to be repeated after technology enhancement in new HMA pavement construction.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos; References; Tables;
  • Pagination: 22p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01043815
  • Record Type: Publication
  • Report/Paper Numbers: 07-1712
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 6:23PM